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105 lines
2.9 KiB
105 lines
2.9 KiB
/* Copyright 2006-2009 Joaquin M Lopez Munoz. |
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* Distributed under the Boost Software License, Version 1.0. |
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* (See accompanying file LICENSE_1_0.txt or copy at |
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* http://www.boost.org/LICENSE_1_0.txt) |
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* |
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* See http://www.boost.org/libs/flyweight for library home page. |
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*/ |
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#ifndef BOOST_FLYWEIGHT_ASSOC_CONTAINER_FACTORY_HPP |
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#define BOOST_FLYWEIGHT_ASSOC_CONTAINER_FACTORY_HPP |
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#if defined(_MSC_VER)&&(_MSC_VER>=1200) |
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#pragma once |
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#endif |
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#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ |
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#include <boost/flyweight/assoc_container_factory_fwd.hpp> |
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#include <boost/flyweight/detail/is_placeholder_expr.hpp> |
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#include <boost/flyweight/detail/nested_xxx_if_not_ph.hpp> |
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#include <boost/flyweight/factory_tag.hpp> |
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#include <boost/mpl/apply.hpp> |
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#include <boost/mpl/aux_/lambda_support.hpp> |
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#include <boost/mpl/if.hpp> |
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namespace boost{namespace flyweights{namespace detail{ |
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BOOST_FLYWEIGHT_NESTED_XXX_IF_NOT_PLACEHOLDER_EXPRESSION_DEF(iterator); |
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BOOST_FLYWEIGHT_NESTED_XXX_IF_NOT_PLACEHOLDER_EXPRESSION_DEF(value_type); |
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}}} /* namespace boost::flyweights::detail */ |
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/* Factory class using a given associative container. |
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*/ |
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namespace boost{ |
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namespace flyweights{ |
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template<typename Container> |
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class assoc_container_factory_class:public factory_marker |
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{ |
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public: |
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/* When assoc_container_factory_class<Container> is an MPL placeholder |
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* expression, referring to Container::iterator and Container::value_type |
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* force the MPL placeholder expression Container to be instantiated, which |
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* is wasteful and can fail in concept-checked STL implementations. |
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* We protect ourselves against this circumstance. |
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*/ |
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typedef typename detail::nested_iterator_if_not_placeholder_expression< |
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Container |
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>::type handle_type; |
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typedef typename detail::nested_value_type_if_not_placeholder_expression< |
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Container |
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>::type entry_type; |
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handle_type insert(const entry_type& x) |
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{ |
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return cont.insert(x).first; |
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} |
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void erase(handle_type h) |
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{ |
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cont.erase(h); |
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} |
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static const entry_type& entry(handle_type h){return *h;} |
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private: |
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/* As above, avoid instantiating Container if it is an |
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* MPL placeholder expression. |
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*/ |
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typedef typename mpl::if_< |
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detail::is_placeholder_expression<Container>, |
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int, |
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Container |
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>::type container_type; |
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container_type cont; |
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public: |
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typedef assoc_container_factory_class type; |
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BOOST_MPL_AUX_LAMBDA_SUPPORT(1,assoc_container_factory_class,(Container)) |
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}; |
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/* assoc_container_factory_class specifier */ |
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template< |
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typename ContainerSpecifier |
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BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION_DEF |
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> |
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struct assoc_container_factory:factory_marker |
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{ |
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template<typename Entry,typename Key> |
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struct apply |
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{ |
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typedef assoc_container_factory_class< |
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typename mpl::apply2<ContainerSpecifier,Entry,Key>::type |
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> type; |
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}; |
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}; |
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} /* namespace flyweights */ |
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} /* namespace boost */ |
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#endif
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